body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    background-color: #f0f2f5;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    margin-top: 20px;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.point-input input {
    width: 60px;
    padding: 5px;
    margin: 2px;
}

canvas {
    border: 1px solid #ccc;
    background-color: #fafafa;
    margin-top: 20px;
    display: block;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover { background-color: #0056b3; }

#results {
    margin-top: 20px;
    font-weight: bold;
    font-size: 1.2rem;
}